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Docker Certified Associate (DCA) exam is an industry-recognized certification that validates an individual’s knowledge and skills in managing and deploying Docker containers. DCA Exam covers a wide range of topics related to Docker and its related technologies, including container networking, image creation and management, container orchestration, and security. Docker Certified Associate (DCA) Exam certification is highly valued in the industry and can lead to higher salaries and promotions. Candidates can prepare for the exam by taking advantage of Docker’s training courses and resources or by using third-party study materials.

Docker Certified Associate (DCA) Exam Sample Questions (Q137-Q142):

NEW QUESTION # 137
Which of the following statements is true about secrets?

A. Secret are stored unencrypted on manager nodes.
B. Secrets can be modified after they are created.
C. Secrets can be created using standard input (STDIN) and a file.
D. Secrets can be created from any node in the cluster.

Answer: C

NEW QUESTION # 138
In Docker Trusted Registry, is this how a user can prevent an image, such as 'nginx:latest', from being overwritten by another user with push access to the repository?
Solution: Tag the image with 'nginx:immutable'.

A. Yes
B. No

Answer: B

Explanation:
Tagging the image with 'nginx:immutable' is not how a user can prevent an image, such as 'nginx:latest', from being overwritten by another user with push access to the repository.Tagging the image with 'nginx:immutable' will only create a new tag for the image, but it will not prevent the original tag from being overwritten. To prevent an image tag from being overwritten in Docker Trusted Registry, the user can use the DTR web UI to make the tag immutable1. This will prevent anyone from pushing a new image with the same tag, even if they have push access to the repository1. Alternatively, the user can also use the DTR API to make the tag immutable2. Reference: Prevent tags from being overwritten), DTR API reference)

NEW QUESTION # 139
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker service create --network --encrypted

A. Yes
B. No

Answer: B

NEW QUESTION # 140
Does this command create a swarm service that only listens on port 53 using the UDP protocol?
Solution: 'docker service create --name dns-cache -p 53:53/udp dns-cache'

A. No
B. Yes

Answer: B

Explanation:
Explanation
= The command 'docker service create --name dns-cache -p 53:53/udp dns-cache' creates a swarm service that only listens on port 53 using the UDP protocol. This is because the -p flag specifies the port mapping between the host and the service, and the /udp suffix indicates the protocol to use1. Port 53 is commonly used for DNS services, which use UDP as the default transport protocol2. The dns-cache argument is the name of the image to use for the service.
References:
* docker service create | Docker Documentation
* DNS - Wikipedia
I hope this helps you understand the command and the protocol, and how they work with Docker and swarm.
If you have any other questions related to Docker, please feel free to ask me.

NEW QUESTION # 141
Does this command create a swarm service that only listens on port 53 using the UDP protocol?
Solution. 'docker service create -name dns-cache -p 53:53 -constraint networking.protocol.udp=true dns-cache"

A. Yes
B. No

Answer: B

Explanation:
Explanation
The command docker service create -name dns-cache -p 53:53 -constraint networking.protocol.udp=true dns-cache will not create a swarm service that only listens on port 53 using the UDP protocol. This command has several syntax errors and invalid options. The correct syntax for creating a swarm service is docker service create [OPTIONS] IMAGE [COMMAND] [ARG...]1. The correct options for specifying the service name, port mapping, and network mode are --name, --publish, and --network respectively1. The option -constraint is not a valid option for the docker service create command. To create a swarm service that only listens on port
53 using the UDP protocol, you need to use the --publish option with
the protocol=udp and mode=host parameters, and the --network option with the host value23. For example, the following command creates a global service using host mode and bypassing the routing mesh2:
docker service create --name dns-cache
--publish published=53,target=53,protocol=udp,mode=host
--mode global
--network host
dns-cache
References:
* 1: docker service create | Docker Docs
* 2: Use swarm mode routing mesh | Docker Docs
* 3: Manage swarm service networks | Docker Docs

NEW QUESTION # 142
......

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Free PDF Docker - Unparalleled DCA - Docker Certified Associate (DCA) Exam Dump Collection

Achieve Docker DCA Certification Without Difficulty with the Help of ActualTestsIT Exam Questions

Docker Certified Associate (DCA) Exam Sample Questions (Q137-Q142):

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